1 /* 2 * Copyright (c) 1982, 1986, 1991, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)in_pcb.c 8.4 (Berkeley) 5/24/95 34 * $FreeBSD$ 35 */ 36 37 #include "opt_ipsec.h" 38 #include "opt_inet6.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/malloc.h> 43 #include <sys/mbuf.h> 44 #include <sys/domain.h> 45 #include <sys/protosw.h> 46 #include <sys/socket.h> 47 #include <sys/socketvar.h> 48 #include <sys/proc.h> 49 #include <sys/jail.h> 50 #include <sys/kernel.h> 51 #include <sys/sysctl.h> 52 53 #include <machine/limits.h> 54 55 #include <vm/uma.h> 56 57 #include <net/if.h> 58 #include <net/if_types.h> 59 #include <net/route.h> 60 61 #include <netinet/in.h> 62 #include <netinet/in_pcb.h> 63 #include <netinet/in_var.h> 64 #include <netinet/ip_var.h> 65 #include <netinet/tcp_var.h> 66 #ifdef INET6 67 #include <netinet/ip6.h> 68 #include <netinet6/ip6_var.h> 69 #endif /* INET6 */ 70 71 #ifdef IPSEC 72 #include <netinet6/ipsec.h> 73 #include <netkey/key.h> 74 #endif /* IPSEC */ 75 76 #ifdef FAST_IPSEC 77 #if defined(IPSEC) || defined(IPSEC_ESP) 78 #error "Bad idea: don't compile with both IPSEC and FAST_IPSEC!" 79 #endif 80 81 #include <netipsec/ipsec.h> 82 #include <netipsec/key.h> 83 #define IPSEC 84 #endif /* FAST_IPSEC */ 85 86 struct in_addr zeroin_addr; 87 88 /* 89 * These configure the range of local port addresses assigned to 90 * "unspecified" outgoing connections/packets/whatever. 91 */ 92 int ipport_lowfirstauto = IPPORT_RESERVED - 1; /* 1023 */ 93 int ipport_lowlastauto = IPPORT_RESERVEDSTART; /* 600 */ 94 int ipport_firstauto = IPPORT_HIFIRSTAUTO; /* 49152 */ 95 int ipport_lastauto = IPPORT_HILASTAUTO; /* 65535 */ 96 int ipport_hifirstauto = IPPORT_HIFIRSTAUTO; /* 49152 */ 97 int ipport_hilastauto = IPPORT_HILASTAUTO; /* 65535 */ 98 99 /* 100 * Reserved ports accessible only to root. There are significant 101 * security considerations that must be accounted for when changing these, 102 * but the security benefits can be great. Please be careful. 103 */ 104 int ipport_reservedhigh = IPPORT_RESERVED - 1; /* 1023 */ 105 int ipport_reservedlow = 0; 106 107 #define RANGECHK(var, min, max) \ 108 if ((var) < (min)) { (var) = (min); } \ 109 else if ((var) > (max)) { (var) = (max); } 110 111 static int 112 sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS) 113 { 114 int error = sysctl_handle_int(oidp, 115 oidp->oid_arg1, oidp->oid_arg2, req); 116 if (!error) { 117 RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1); 118 RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1); 119 RANGECHK(ipport_firstauto, IPPORT_RESERVED, USHRT_MAX); 120 RANGECHK(ipport_lastauto, IPPORT_RESERVED, USHRT_MAX); 121 RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, USHRT_MAX); 122 RANGECHK(ipport_hilastauto, IPPORT_RESERVED, USHRT_MAX); 123 } 124 return error; 125 } 126 127 #undef RANGECHK 128 129 SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports"); 130 131 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW, 132 &ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", ""); 133 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW, 134 &ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", ""); 135 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW, 136 &ipport_firstauto, 0, &sysctl_net_ipport_check, "I", ""); 137 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW, 138 &ipport_lastauto, 0, &sysctl_net_ipport_check, "I", ""); 139 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW, 140 &ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", ""); 141 SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW, 142 &ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", ""); 143 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, reservedhigh, 144 CTLFLAG_RW|CTLFLAG_SECURE, &ipport_reservedhigh, 0, ""); 145 SYSCTL_INT(_net_inet_ip_portrange, OID_AUTO, reservedlow, 146 CTLFLAG_RW|CTLFLAG_SECURE, &ipport_reservedlow, 0, ""); 147 148 /* 149 * in_pcb.c: manage the Protocol Control Blocks. 150 * 151 * NOTE: It is assumed that most of these functions will be called at 152 * splnet(). XXX - There are, unfortunately, a few exceptions to this 153 * rule that should be fixed. 154 */ 155 156 /* 157 * Allocate a PCB and associate it with the socket. 158 */ 159 int 160 in_pcballoc(so, pcbinfo, td) 161 struct socket *so; 162 struct inpcbinfo *pcbinfo; 163 struct thread *td; 164 { 165 register struct inpcb *inp; 166 #ifdef IPSEC 167 int error; 168 #endif 169 170 inp = uma_zalloc(pcbinfo->ipi_zone, M_NOWAIT); 171 if (inp == NULL) 172 return (ENOBUFS); 173 bzero((caddr_t)inp, sizeof(*inp)); 174 inp->inp_gencnt = ++pcbinfo->ipi_gencnt; 175 inp->inp_pcbinfo = pcbinfo; 176 inp->inp_socket = so; 177 #ifdef IPSEC 178 error = ipsec_init_policy(so, &inp->inp_sp); 179 if (error != 0) { 180 uma_zfree(pcbinfo->ipi_zone, inp); 181 return error; 182 } 183 #endif /*IPSEC*/ 184 #if defined(INET6) 185 if (INP_SOCKAF(so) == AF_INET6) { 186 inp->inp_vflag |= INP_IPV6PROTO; 187 if (ip6_v6only) 188 inp->inp_flags |= IN6P_IPV6_V6ONLY; 189 } 190 #endif 191 LIST_INSERT_HEAD(pcbinfo->listhead, inp, inp_list); 192 pcbinfo->ipi_count++; 193 so->so_pcb = (caddr_t)inp; 194 INP_LOCK_INIT(inp, "inp"); 195 #ifdef INET6 196 if (ip6_auto_flowlabel) 197 inp->inp_flags |= IN6P_AUTOFLOWLABEL; 198 #endif 199 return (0); 200 } 201 202 int 203 in_pcbbind(inp, nam, td) 204 register struct inpcb *inp; 205 struct sockaddr *nam; 206 struct thread *td; 207 { 208 int anonport, error; 209 210 if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY) 211 return (EINVAL); 212 anonport = inp->inp_lport == 0 && (nam == NULL || 213 ((struct sockaddr_in *)nam)->sin_port == 0); 214 error = in_pcbbind_setup(inp, nam, &inp->inp_laddr.s_addr, 215 &inp->inp_lport, td); 216 if (error) 217 return (error); 218 if (in_pcbinshash(inp) != 0) { 219 inp->inp_laddr.s_addr = INADDR_ANY; 220 inp->inp_lport = 0; 221 return (EAGAIN); 222 } 223 if (anonport) 224 inp->inp_flags |= INP_ANONPORT; 225 return (0); 226 } 227 228 /* 229 * Set up a bind operation on a PCB, performing port allocation 230 * as required, but do not actually modify the PCB. Callers can 231 * either complete the bind by setting inp_laddr/inp_lport and 232 * calling in_pcbinshash(), or they can just use the resulting 233 * port and address to authorise the sending of a once-off packet. 234 * 235 * On error, the values of *laddrp and *lportp are not changed. 236 */ 237 int 238 in_pcbbind_setup(inp, nam, laddrp, lportp, td) 239 struct inpcb *inp; 240 struct sockaddr *nam; 241 in_addr_t *laddrp; 242 u_short *lportp; 243 struct thread *td; 244 { 245 struct socket *so = inp->inp_socket; 246 unsigned short *lastport; 247 struct sockaddr_in *sin; 248 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 249 struct in_addr laddr; 250 u_short lport = 0; 251 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 252 int error, prison = 0; 253 254 if (TAILQ_EMPTY(&in_ifaddrhead)) /* XXX broken! */ 255 return (EADDRNOTAVAIL); 256 laddr.s_addr = *laddrp; 257 if (nam != NULL && laddr.s_addr != INADDR_ANY) 258 return (EINVAL); 259 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 260 wild = 1; 261 if (nam) { 262 sin = (struct sockaddr_in *)nam; 263 if (nam->sa_len != sizeof (*sin)) 264 return (EINVAL); 265 #ifdef notdef 266 /* 267 * We should check the family, but old programs 268 * incorrectly fail to initialize it. 269 */ 270 if (sin->sin_family != AF_INET) 271 return (EAFNOSUPPORT); 272 #endif 273 if (sin->sin_addr.s_addr != INADDR_ANY) 274 if (prison_ip(td->td_ucred, 0, &sin->sin_addr.s_addr)) 275 return(EINVAL); 276 if (sin->sin_port != *lportp) { 277 /* Don't allow the port to change. */ 278 if (*lportp != 0) 279 return (EINVAL); 280 lport = sin->sin_port; 281 } 282 /* NB: lport is left as 0 if the port isn't being changed. */ 283 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) { 284 /* 285 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 286 * allow complete duplication of binding if 287 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 288 * and a multicast address is bound on both 289 * new and duplicated sockets. 290 */ 291 if (so->so_options & SO_REUSEADDR) 292 reuseport = SO_REUSEADDR|SO_REUSEPORT; 293 } else if (sin->sin_addr.s_addr != INADDR_ANY) { 294 sin->sin_port = 0; /* yech... */ 295 bzero(&sin->sin_zero, sizeof(sin->sin_zero)); 296 if (ifa_ifwithaddr((struct sockaddr *)sin) == 0) 297 return (EADDRNOTAVAIL); 298 } 299 laddr = sin->sin_addr; 300 if (lport) { 301 struct inpcb *t; 302 /* GROSS */ 303 if (ntohs(lport) <= ipport_reservedhigh && 304 ntohs(lport) >= ipport_reservedlow && 305 td && suser_cred(td->td_ucred, PRISON_ROOT)) 306 return (EACCES); 307 if (td && jailed(td->td_ucred)) 308 prison = 1; 309 if (so->so_cred->cr_uid != 0 && 310 !IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) { 311 t = in_pcblookup_local(inp->inp_pcbinfo, 312 sin->sin_addr, lport, 313 prison ? 0 : INPLOOKUP_WILDCARD); 314 /* 315 * XXX 316 * This entire block sorely needs a rewrite. 317 */ 318 if (t && (t->inp_vflag & INP_TIMEWAIT)) { 319 if ((ntohl(sin->sin_addr.s_addr) != INADDR_ANY || 320 ntohl(t->inp_laddr.s_addr) != INADDR_ANY || 321 (intotw(t)->tw_so_options & SO_REUSEPORT) == 0) && 322 (so->so_cred->cr_uid != intotw(t)->tw_cred->cr_uid)) 323 return (EADDRINUSE); 324 } else 325 if (t && 326 (ntohl(sin->sin_addr.s_addr) != INADDR_ANY || 327 ntohl(t->inp_laddr.s_addr) != INADDR_ANY || 328 (t->inp_socket->so_options & 329 SO_REUSEPORT) == 0) && 330 (so->so_cred->cr_uid != 331 t->inp_socket->so_cred->cr_uid)) { 332 #if defined(INET6) 333 if (ntohl(sin->sin_addr.s_addr) != 334 INADDR_ANY || 335 ntohl(t->inp_laddr.s_addr) != 336 INADDR_ANY || 337 INP_SOCKAF(so) == 338 INP_SOCKAF(t->inp_socket)) 339 #endif /* defined(INET6) */ 340 return (EADDRINUSE); 341 } 342 } 343 if (prison && 344 prison_ip(td->td_ucred, 0, &sin->sin_addr.s_addr)) 345 return (EADDRNOTAVAIL); 346 t = in_pcblookup_local(pcbinfo, sin->sin_addr, 347 lport, prison ? 0 : wild); 348 if (t && (t->inp_vflag & INP_TIMEWAIT)) { 349 if ((reuseport & intotw(t)->tw_so_options) == 0) 350 return (EADDRINUSE); 351 } else 352 if (t && 353 (reuseport & t->inp_socket->so_options) == 0) { 354 #if defined(INET6) 355 if (ntohl(sin->sin_addr.s_addr) != 356 INADDR_ANY || 357 ntohl(t->inp_laddr.s_addr) != 358 INADDR_ANY || 359 INP_SOCKAF(so) == 360 INP_SOCKAF(t->inp_socket)) 361 #endif /* defined(INET6) */ 362 return (EADDRINUSE); 363 } 364 } 365 } 366 if (*lportp != 0) 367 lport = *lportp; 368 if (lport == 0) { 369 ushort first, last; 370 int count; 371 372 if (laddr.s_addr != INADDR_ANY) 373 if (prison_ip(td->td_ucred, 0, &laddr.s_addr)) 374 return (EINVAL); 375 376 if (inp->inp_flags & INP_HIGHPORT) { 377 first = ipport_hifirstauto; /* sysctl */ 378 last = ipport_hilastauto; 379 lastport = &pcbinfo->lasthi; 380 } else if (inp->inp_flags & INP_LOWPORT) { 381 if (td && (error = suser_cred(td->td_ucred, 382 PRISON_ROOT)) != 0) 383 return error; 384 first = ipport_lowfirstauto; /* 1023 */ 385 last = ipport_lowlastauto; /* 600 */ 386 lastport = &pcbinfo->lastlow; 387 } else { 388 first = ipport_firstauto; /* sysctl */ 389 last = ipport_lastauto; 390 lastport = &pcbinfo->lastport; 391 } 392 /* 393 * Simple check to ensure all ports are not used up causing 394 * a deadlock here. 395 * 396 * We split the two cases (up and down) so that the direction 397 * is not being tested on each round of the loop. 398 */ 399 if (first > last) { 400 /* 401 * counting down 402 */ 403 count = first - last; 404 405 do { 406 if (count-- < 0) /* completely used? */ 407 return (EADDRNOTAVAIL); 408 --*lastport; 409 if (*lastport > first || *lastport < last) 410 *lastport = first; 411 lport = htons(*lastport); 412 } while (in_pcblookup_local(pcbinfo, laddr, lport, 413 wild)); 414 } else { 415 /* 416 * counting up 417 */ 418 count = last - first; 419 420 do { 421 if (count-- < 0) /* completely used? */ 422 return (EADDRNOTAVAIL); 423 ++*lastport; 424 if (*lastport < first || *lastport > last) 425 *lastport = first; 426 lport = htons(*lastport); 427 } while (in_pcblookup_local(pcbinfo, laddr, lport, 428 wild)); 429 } 430 } 431 if (prison_ip(td->td_ucred, 0, &laddr.s_addr)) 432 return (EINVAL); 433 *laddrp = laddr.s_addr; 434 *lportp = lport; 435 return (0); 436 } 437 438 /* 439 * Connect from a socket to a specified address. 440 * Both address and port must be specified in argument sin. 441 * If don't have a local address for this socket yet, 442 * then pick one. 443 */ 444 int 445 in_pcbconnect(inp, nam, td) 446 register struct inpcb *inp; 447 struct sockaddr *nam; 448 struct thread *td; 449 { 450 u_short lport, fport; 451 in_addr_t laddr, faddr; 452 int anonport, error; 453 454 lport = inp->inp_lport; 455 laddr = inp->inp_laddr.s_addr; 456 anonport = (lport == 0); 457 error = in_pcbconnect_setup(inp, nam, &laddr, &lport, &faddr, &fport, 458 NULL, td); 459 if (error) 460 return (error); 461 462 /* Do the initial binding of the local address if required. */ 463 if (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) { 464 inp->inp_lport = lport; 465 inp->inp_laddr.s_addr = laddr; 466 if (in_pcbinshash(inp) != 0) { 467 inp->inp_laddr.s_addr = INADDR_ANY; 468 inp->inp_lport = 0; 469 return (EAGAIN); 470 } 471 } 472 473 /* Commit the remaining changes. */ 474 inp->inp_lport = lport; 475 inp->inp_laddr.s_addr = laddr; 476 inp->inp_faddr.s_addr = faddr; 477 inp->inp_fport = fport; 478 in_pcbrehash(inp); 479 if (anonport) 480 inp->inp_flags |= INP_ANONPORT; 481 return (0); 482 } 483 484 /* 485 * Set up for a connect from a socket to the specified address. 486 * On entry, *laddrp and *lportp should contain the current local 487 * address and port for the PCB; these are updated to the values 488 * that should be placed in inp_laddr and inp_lport to complete 489 * the connect. 490 * 491 * On success, *faddrp and *fportp will be set to the remote address 492 * and port. These are not updated in the error case. 493 * 494 * If the operation fails because the connection already exists, 495 * *oinpp will be set to the PCB of that connection so that the 496 * caller can decide to override it. In all other cases, *oinpp 497 * is set to NULL. 498 */ 499 int 500 in_pcbconnect_setup(inp, nam, laddrp, lportp, faddrp, fportp, oinpp, td) 501 register struct inpcb *inp; 502 struct sockaddr *nam; 503 in_addr_t *laddrp; 504 u_short *lportp; 505 in_addr_t *faddrp; 506 u_short *fportp; 507 struct inpcb **oinpp; 508 struct thread *td; 509 { 510 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 511 struct in_ifaddr *ia; 512 struct sockaddr_in sa; 513 struct ucred *cred; 514 struct inpcb *oinp; 515 struct in_addr laddr, faddr; 516 u_short lport, fport; 517 int error; 518 519 if (oinpp != NULL) 520 *oinpp = NULL; 521 if (nam->sa_len != sizeof (*sin)) 522 return (EINVAL); 523 if (sin->sin_family != AF_INET) 524 return (EAFNOSUPPORT); 525 if (sin->sin_port == 0) 526 return (EADDRNOTAVAIL); 527 laddr.s_addr = *laddrp; 528 lport = *lportp; 529 faddr = sin->sin_addr; 530 fport = sin->sin_port; 531 cred = inp->inp_socket->so_cred; 532 if (laddr.s_addr == INADDR_ANY && jailed(cred)) { 533 bzero(&sa, sizeof(sa)); 534 sa.sin_addr.s_addr = htonl(prison_getip(cred)); 535 sa.sin_len = sizeof(sa); 536 sa.sin_family = AF_INET; 537 error = in_pcbbind_setup(inp, (struct sockaddr *)&sa, 538 &laddr.s_addr, &lport, td); 539 if (error) 540 return (error); 541 } 542 543 if (!TAILQ_EMPTY(&in_ifaddrhead)) { 544 /* 545 * If the destination address is INADDR_ANY, 546 * use the primary local address. 547 * If the supplied address is INADDR_BROADCAST, 548 * and the primary interface supports broadcast, 549 * choose the broadcast address for that interface. 550 */ 551 if (faddr.s_addr == INADDR_ANY) 552 faddr = IA_SIN(TAILQ_FIRST(&in_ifaddrhead))->sin_addr; 553 else if (faddr.s_addr == (u_long)INADDR_BROADCAST && 554 (TAILQ_FIRST(&in_ifaddrhead)->ia_ifp->if_flags & 555 IFF_BROADCAST)) 556 faddr = satosin(&TAILQ_FIRST( 557 &in_ifaddrhead)->ia_broadaddr)->sin_addr; 558 } 559 if (laddr.s_addr == INADDR_ANY) { 560 register struct route *ro; 561 562 ia = (struct in_ifaddr *)0; 563 /* 564 * If route is known or can be allocated now, 565 * our src addr is taken from the i/f, else punt. 566 * Note that we should check the address family of the cached 567 * destination, in case of sharing the cache with IPv6. 568 */ 569 ro = &inp->inp_route; 570 if (ro->ro_rt && 571 (ro->ro_dst.sa_family != AF_INET || 572 satosin(&ro->ro_dst)->sin_addr.s_addr != faddr.s_addr || 573 inp->inp_socket->so_options & SO_DONTROUTE)) { 574 RTFREE(ro->ro_rt); 575 ro->ro_rt = (struct rtentry *)0; 576 } 577 if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/ 578 (ro->ro_rt == (struct rtentry *)0 || 579 ro->ro_rt->rt_ifp == (struct ifnet *)0)) { 580 /* No route yet, so try to acquire one */ 581 bzero(&ro->ro_dst, sizeof(struct sockaddr_in)); 582 ro->ro_dst.sa_family = AF_INET; 583 ro->ro_dst.sa_len = sizeof(struct sockaddr_in); 584 ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = faddr; 585 rtalloc(ro); 586 } 587 /* 588 * If we found a route, use the address 589 * corresponding to the outgoing interface 590 * unless it is the loopback (in case a route 591 * to our address on another net goes to loopback). 592 */ 593 if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)) 594 ia = ifatoia(ro->ro_rt->rt_ifa); 595 if (ia == 0) { 596 bzero(&sa, sizeof(sa)); 597 sa.sin_addr = faddr; 598 sa.sin_len = sizeof(sa); 599 sa.sin_family = AF_INET; 600 601 ia = ifatoia(ifa_ifwithdstaddr(sintosa(&sa))); 602 if (ia == 0) 603 ia = ifatoia(ifa_ifwithnet(sintosa(&sa))); 604 if (ia == 0) 605 ia = TAILQ_FIRST(&in_ifaddrhead); 606 if (ia == 0) 607 return (EADDRNOTAVAIL); 608 } 609 /* 610 * If the destination address is multicast and an outgoing 611 * interface has been set as a multicast option, use the 612 * address of that interface as our source address. 613 */ 614 if (IN_MULTICAST(ntohl(faddr.s_addr)) && 615 inp->inp_moptions != NULL) { 616 struct ip_moptions *imo; 617 struct ifnet *ifp; 618 619 imo = inp->inp_moptions; 620 if (imo->imo_multicast_ifp != NULL) { 621 ifp = imo->imo_multicast_ifp; 622 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) 623 if (ia->ia_ifp == ifp) 624 break; 625 if (ia == 0) 626 return (EADDRNOTAVAIL); 627 } 628 } 629 laddr = ia->ia_addr.sin_addr; 630 } 631 632 oinp = in_pcblookup_hash(inp->inp_pcbinfo, faddr, fport, laddr, lport, 633 0, NULL); 634 if (oinp != NULL) { 635 if (oinpp != NULL) 636 *oinpp = oinp; 637 return (EADDRINUSE); 638 } 639 if (lport == 0) { 640 error = in_pcbbind_setup(inp, NULL, &laddr.s_addr, &lport, td); 641 if (error) 642 return (error); 643 } 644 *laddrp = laddr.s_addr; 645 *lportp = lport; 646 *faddrp = faddr.s_addr; 647 *fportp = fport; 648 return (0); 649 } 650 651 void 652 in_pcbdisconnect(inp) 653 struct inpcb *inp; 654 { 655 656 inp->inp_faddr.s_addr = INADDR_ANY; 657 inp->inp_fport = 0; 658 in_pcbrehash(inp); 659 if (inp->inp_socket->so_state & SS_NOFDREF) 660 in_pcbdetach(inp); 661 } 662 663 void 664 in_pcbdetach(inp) 665 struct inpcb *inp; 666 { 667 struct socket *so = inp->inp_socket; 668 struct inpcbinfo *ipi = inp->inp_pcbinfo; 669 670 #ifdef IPSEC 671 ipsec4_delete_pcbpolicy(inp); 672 #endif /*IPSEC*/ 673 inp->inp_gencnt = ++ipi->ipi_gencnt; 674 in_pcbremlists(inp); 675 if (so) { 676 so->so_pcb = 0; 677 sotryfree(so); 678 } 679 if (inp->inp_options) 680 (void)m_free(inp->inp_options); 681 if (inp->inp_route.ro_rt) 682 rtfree(inp->inp_route.ro_rt); 683 ip_freemoptions(inp->inp_moptions); 684 inp->inp_vflag = 0; 685 INP_LOCK_DESTROY(inp); 686 uma_zfree(ipi->ipi_zone, inp); 687 } 688 689 struct sockaddr * 690 in_sockaddr(port, addr_p) 691 in_port_t port; 692 struct in_addr *addr_p; 693 { 694 struct sockaddr_in *sin; 695 696 MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME, 697 M_WAITOK | M_ZERO); 698 sin->sin_family = AF_INET; 699 sin->sin_len = sizeof(*sin); 700 sin->sin_addr = *addr_p; 701 sin->sin_port = port; 702 703 return (struct sockaddr *)sin; 704 } 705 706 /* 707 * The wrapper function will pass down the pcbinfo for this function to lock. 708 * The socket must have a valid 709 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 710 * except through a kernel programming error, so it is acceptable to panic 711 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 712 * because there actually /is/ a programming error somewhere... XXX) 713 */ 714 int 715 in_setsockaddr(so, nam, pcbinfo) 716 struct socket *so; 717 struct sockaddr **nam; 718 struct inpcbinfo *pcbinfo; 719 { 720 int s; 721 register struct inpcb *inp; 722 struct in_addr addr; 723 in_port_t port; 724 725 s = splnet(); 726 INP_INFO_RLOCK(pcbinfo); 727 inp = sotoinpcb(so); 728 if (!inp) { 729 INP_INFO_RUNLOCK(pcbinfo); 730 splx(s); 731 return ECONNRESET; 732 } 733 INP_LOCK(inp); 734 port = inp->inp_lport; 735 addr = inp->inp_laddr; 736 INP_UNLOCK(inp); 737 INP_INFO_RUNLOCK(pcbinfo); 738 splx(s); 739 740 *nam = in_sockaddr(port, &addr); 741 return 0; 742 } 743 744 /* 745 * The wrapper function will pass down the pcbinfo for this function to lock. 746 */ 747 int 748 in_setpeeraddr(so, nam, pcbinfo) 749 struct socket *so; 750 struct sockaddr **nam; 751 struct inpcbinfo *pcbinfo; 752 { 753 int s; 754 register struct inpcb *inp; 755 struct in_addr addr; 756 in_port_t port; 757 758 s = splnet(); 759 INP_INFO_RLOCK(pcbinfo); 760 inp = sotoinpcb(so); 761 if (!inp) { 762 INP_INFO_RUNLOCK(pcbinfo); 763 splx(s); 764 return ECONNRESET; 765 } 766 INP_LOCK(inp); 767 port = inp->inp_fport; 768 addr = inp->inp_faddr; 769 INP_UNLOCK(inp); 770 INP_INFO_RUNLOCK(pcbinfo); 771 splx(s); 772 773 *nam = in_sockaddr(port, &addr); 774 return 0; 775 } 776 777 void 778 in_pcbnotifyall(pcbinfo, faddr, errno, notify) 779 struct inpcbinfo *pcbinfo; 780 struct in_addr faddr; 781 int errno; 782 struct inpcb *(*notify)(struct inpcb *, int); 783 { 784 struct inpcb *inp, *ninp; 785 struct inpcbhead *head; 786 int s; 787 788 s = splnet(); 789 INP_INFO_WLOCK(pcbinfo); 790 head = pcbinfo->listhead; 791 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 792 INP_LOCK(inp); 793 ninp = LIST_NEXT(inp, inp_list); 794 #ifdef INET6 795 if ((inp->inp_vflag & INP_IPV4) == 0) { 796 INP_UNLOCK(inp); 797 continue; 798 } 799 #endif 800 if (inp->inp_faddr.s_addr != faddr.s_addr || 801 inp->inp_socket == NULL) { 802 INP_UNLOCK(inp); 803 continue; 804 } 805 if ((*notify)(inp, errno)) 806 INP_UNLOCK(inp); 807 } 808 INP_INFO_WUNLOCK(pcbinfo); 809 splx(s); 810 } 811 812 void 813 in_pcbpurgeif0(pcbinfo, ifp) 814 struct inpcbinfo *pcbinfo; 815 struct ifnet *ifp; 816 { 817 struct inpcb *inp; 818 struct ip_moptions *imo; 819 int i, gap; 820 821 /* why no splnet here? XXX */ 822 INP_INFO_RLOCK(pcbinfo); 823 LIST_FOREACH(inp, pcbinfo->listhead, inp_list) { 824 INP_LOCK(inp); 825 imo = inp->inp_moptions; 826 if ((inp->inp_vflag & INP_IPV4) && 827 imo != NULL) { 828 /* 829 * Unselect the outgoing interface if it is being 830 * detached. 831 */ 832 if (imo->imo_multicast_ifp == ifp) 833 imo->imo_multicast_ifp = NULL; 834 835 /* 836 * Drop multicast group membership if we joined 837 * through the interface being detached. 838 */ 839 for (i = 0, gap = 0; i < imo->imo_num_memberships; 840 i++) { 841 if (imo->imo_membership[i]->inm_ifp == ifp) { 842 in_delmulti(imo->imo_membership[i]); 843 gap++; 844 } else if (gap != 0) 845 imo->imo_membership[i - gap] = 846 imo->imo_membership[i]; 847 } 848 imo->imo_num_memberships -= gap; 849 } 850 INP_UNLOCK(inp); 851 } 852 INP_INFO_RUNLOCK(pcbinfo); 853 } 854 855 /* 856 * Check for alternatives when higher level complains 857 * about service problems. For now, invalidate cached 858 * routing information. If the route was created dynamically 859 * (by a redirect), time to try a default gateway again. 860 */ 861 void 862 in_losing(inp) 863 struct inpcb *inp; 864 { 865 register struct rtentry *rt; 866 struct rt_addrinfo info; 867 868 if ((rt = inp->inp_route.ro_rt)) { 869 bzero((caddr_t)&info, sizeof(info)); 870 info.rti_flags = rt->rt_flags; 871 info.rti_info[RTAX_DST] = rt_key(rt); 872 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 873 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 874 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 875 if (rt->rt_flags & RTF_DYNAMIC) 876 (void) rtrequest1(RTM_DELETE, &info, NULL); 877 inp->inp_route.ro_rt = NULL; 878 rtfree(rt); 879 /* 880 * A new route can be allocated 881 * the next time output is attempted. 882 */ 883 } 884 } 885 886 /* 887 * After a routing change, flush old routing 888 * and allocate a (hopefully) better one. 889 */ 890 struct inpcb * 891 in_rtchange(inp, errno) 892 register struct inpcb *inp; 893 int errno; 894 { 895 if (inp->inp_route.ro_rt) { 896 rtfree(inp->inp_route.ro_rt); 897 inp->inp_route.ro_rt = 0; 898 /* 899 * A new route can be allocated the next time 900 * output is attempted. 901 */ 902 } 903 return inp; 904 } 905 906 /* 907 * Lookup a PCB based on the local address and port. 908 */ 909 struct inpcb * 910 in_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay) 911 struct inpcbinfo *pcbinfo; 912 struct in_addr laddr; 913 u_int lport_arg; 914 int wild_okay; 915 { 916 register struct inpcb *inp; 917 int matchwild = 3, wildcard; 918 u_short lport = lport_arg; 919 920 if (!wild_okay) { 921 struct inpcbhead *head; 922 /* 923 * Look for an unconnected (wildcard foreign addr) PCB that 924 * matches the local address and port we're looking for. 925 */ 926 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)]; 927 LIST_FOREACH(inp, head, inp_hash) { 928 #ifdef INET6 929 if ((inp->inp_vflag & INP_IPV4) == 0) 930 continue; 931 #endif 932 if (inp->inp_faddr.s_addr == INADDR_ANY && 933 inp->inp_laddr.s_addr == laddr.s_addr && 934 inp->inp_lport == lport) { 935 /* 936 * Found. 937 */ 938 return (inp); 939 } 940 } 941 /* 942 * Not found. 943 */ 944 return (NULL); 945 } else { 946 struct inpcbporthead *porthash; 947 struct inpcbport *phd; 948 struct inpcb *match = NULL; 949 /* 950 * Best fit PCB lookup. 951 * 952 * First see if this local port is in use by looking on the 953 * port hash list. 954 */ 955 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 956 pcbinfo->porthashmask)]; 957 LIST_FOREACH(phd, porthash, phd_hash) { 958 if (phd->phd_port == lport) 959 break; 960 } 961 if (phd != NULL) { 962 /* 963 * Port is in use by one or more PCBs. Look for best 964 * fit. 965 */ 966 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 967 wildcard = 0; 968 #ifdef INET6 969 if ((inp->inp_vflag & INP_IPV4) == 0) 970 continue; 971 #endif 972 if (inp->inp_faddr.s_addr != INADDR_ANY) 973 wildcard++; 974 if (inp->inp_laddr.s_addr != INADDR_ANY) { 975 if (laddr.s_addr == INADDR_ANY) 976 wildcard++; 977 else if (inp->inp_laddr.s_addr != laddr.s_addr) 978 continue; 979 } else { 980 if (laddr.s_addr != INADDR_ANY) 981 wildcard++; 982 } 983 if (wildcard < matchwild) { 984 match = inp; 985 matchwild = wildcard; 986 if (matchwild == 0) { 987 break; 988 } 989 } 990 } 991 } 992 return (match); 993 } 994 } 995 996 /* 997 * Lookup PCB in hash list. 998 */ 999 struct inpcb * 1000 in_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, 1001 ifp) 1002 struct inpcbinfo *pcbinfo; 1003 struct in_addr faddr, laddr; 1004 u_int fport_arg, lport_arg; 1005 int wildcard; 1006 struct ifnet *ifp; 1007 { 1008 struct inpcbhead *head; 1009 register struct inpcb *inp; 1010 u_short fport = fport_arg, lport = lport_arg; 1011 1012 /* 1013 * First look for an exact match. 1014 */ 1015 head = &pcbinfo->hashbase[INP_PCBHASH(faddr.s_addr, lport, fport, pcbinfo->hashmask)]; 1016 LIST_FOREACH(inp, head, inp_hash) { 1017 #ifdef INET6 1018 if ((inp->inp_vflag & INP_IPV4) == 0) 1019 continue; 1020 #endif 1021 if (inp->inp_faddr.s_addr == faddr.s_addr && 1022 inp->inp_laddr.s_addr == laddr.s_addr && 1023 inp->inp_fport == fport && 1024 inp->inp_lport == lport) { 1025 /* 1026 * Found. 1027 */ 1028 return (inp); 1029 } 1030 } 1031 if (wildcard) { 1032 struct inpcb *local_wild = NULL; 1033 #if defined(INET6) 1034 struct inpcb *local_wild_mapped = NULL; 1035 #endif /* defined(INET6) */ 1036 1037 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)]; 1038 LIST_FOREACH(inp, head, inp_hash) { 1039 #ifdef INET6 1040 if ((inp->inp_vflag & INP_IPV4) == 0) 1041 continue; 1042 #endif 1043 if (inp->inp_faddr.s_addr == INADDR_ANY && 1044 inp->inp_lport == lport) { 1045 if (ifp && ifp->if_type == IFT_FAITH && 1046 (inp->inp_flags & INP_FAITH) == 0) 1047 continue; 1048 if (inp->inp_laddr.s_addr == laddr.s_addr) 1049 return (inp); 1050 else if (inp->inp_laddr.s_addr == INADDR_ANY) { 1051 #if defined(INET6) 1052 if (INP_CHECK_SOCKAF(inp->inp_socket, 1053 AF_INET6)) 1054 local_wild_mapped = inp; 1055 else 1056 #endif /* defined(INET6) */ 1057 local_wild = inp; 1058 } 1059 } 1060 } 1061 #if defined(INET6) 1062 if (local_wild == NULL) 1063 return (local_wild_mapped); 1064 #endif /* defined(INET6) */ 1065 return (local_wild); 1066 } 1067 1068 /* 1069 * Not found. 1070 */ 1071 return (NULL); 1072 } 1073 1074 /* 1075 * Insert PCB onto various hash lists. 1076 */ 1077 int 1078 in_pcbinshash(inp) 1079 struct inpcb *inp; 1080 { 1081 struct inpcbhead *pcbhash; 1082 struct inpcbporthead *pcbporthash; 1083 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 1084 struct inpcbport *phd; 1085 u_int32_t hashkey_faddr; 1086 1087 #ifdef INET6 1088 if (inp->inp_vflag & INP_IPV6) 1089 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */; 1090 else 1091 #endif /* INET6 */ 1092 hashkey_faddr = inp->inp_faddr.s_addr; 1093 1094 pcbhash = &pcbinfo->hashbase[INP_PCBHASH(hashkey_faddr, 1095 inp->inp_lport, inp->inp_fport, pcbinfo->hashmask)]; 1096 1097 pcbporthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(inp->inp_lport, 1098 pcbinfo->porthashmask)]; 1099 1100 /* 1101 * Go through port list and look for a head for this lport. 1102 */ 1103 LIST_FOREACH(phd, pcbporthash, phd_hash) { 1104 if (phd->phd_port == inp->inp_lport) 1105 break; 1106 } 1107 /* 1108 * If none exists, malloc one and tack it on. 1109 */ 1110 if (phd == NULL) { 1111 MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport), M_PCB, M_NOWAIT); 1112 if (phd == NULL) { 1113 return (ENOBUFS); /* XXX */ 1114 } 1115 phd->phd_port = inp->inp_lport; 1116 LIST_INIT(&phd->phd_pcblist); 1117 LIST_INSERT_HEAD(pcbporthash, phd, phd_hash); 1118 } 1119 inp->inp_phd = phd; 1120 LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist); 1121 LIST_INSERT_HEAD(pcbhash, inp, inp_hash); 1122 return (0); 1123 } 1124 1125 /* 1126 * Move PCB to the proper hash bucket when { faddr, fport } have been 1127 * changed. NOTE: This does not handle the case of the lport changing (the 1128 * hashed port list would have to be updated as well), so the lport must 1129 * not change after in_pcbinshash() has been called. 1130 */ 1131 void 1132 in_pcbrehash(inp) 1133 struct inpcb *inp; 1134 { 1135 struct inpcbhead *head; 1136 u_int32_t hashkey_faddr; 1137 1138 #ifdef INET6 1139 if (inp->inp_vflag & INP_IPV6) 1140 hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */; 1141 else 1142 #endif /* INET6 */ 1143 hashkey_faddr = inp->inp_faddr.s_addr; 1144 1145 head = &inp->inp_pcbinfo->hashbase[INP_PCBHASH(hashkey_faddr, 1146 inp->inp_lport, inp->inp_fport, inp->inp_pcbinfo->hashmask)]; 1147 1148 LIST_REMOVE(inp, inp_hash); 1149 LIST_INSERT_HEAD(head, inp, inp_hash); 1150 } 1151 1152 /* 1153 * Remove PCB from various lists. 1154 */ 1155 void 1156 in_pcbremlists(inp) 1157 struct inpcb *inp; 1158 { 1159 inp->inp_gencnt = ++inp->inp_pcbinfo->ipi_gencnt; 1160 if (inp->inp_lport) { 1161 struct inpcbport *phd = inp->inp_phd; 1162 1163 LIST_REMOVE(inp, inp_hash); 1164 LIST_REMOVE(inp, inp_portlist); 1165 if (LIST_FIRST(&phd->phd_pcblist) == NULL) { 1166 LIST_REMOVE(phd, phd_hash); 1167 free(phd, M_PCB); 1168 } 1169 } 1170 LIST_REMOVE(inp, inp_list); 1171 inp->inp_pcbinfo->ipi_count--; 1172 } 1173 1174 int 1175 prison_xinpcb(struct thread *td, struct inpcb *inp) 1176 { 1177 if (!jailed(td->td_ucred)) 1178 return (0); 1179 if (ntohl(inp->inp_laddr.s_addr) == prison_getip(td->td_ucred)) 1180 return (0); 1181 return (1); 1182 } 1183